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Implement RFC4075 Receive SNTP servers via DHCPv6

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This adds support for RFC4075 SNTP server configuration via DHCPv6.
The DHCPv6 options transmitted are now conditional on how LwIP is
configured.

A new SNTP application option SNTP_GET_SERVERS_FROM_DHCPV6 is used
to enable. For simplicity this is configured to use the global
LWIP_DHCP6_GET_NTP_SRV configuration setting.

Tests:
 - Check the global options now control the DHCPv6 request sent
   in Wireshark
 - Check against 0, 1 and 3 SNTP servers configured on an odhcpd
   server configured to support RFC 4075 SNTP server lists.
   Verify that the SNTP server list is updated on connection
   establishment on an ESP8266 WeMOS D1.
 - Verify that SNTP packets are sent and recieved from a
   configured server and that system time is updated.

Signed-off-by: David J. Fiddes <D.J@fiddes.net>
This commit is contained in:
David J. Fiddes
2019-01-19 12:21:56 +00:00
committed by Simon Goldschmidt
parent 3cb6ae7770
commit 8f2f43f093
4 changed files with 51 additions and 8 deletions
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11
src/core/ipv6/dhcp6.c
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@@ -451,7 +451,16 @@ dhcp6_msg_finalize(u16_t options_out_len, struct pbuf *p_out)
static void
dhcp6_information_request(struct netif *netif, struct dhcp6 *dhcp6)
{
const u16_t requested_options[] = {DHCP6_OPTION_DNS_SERVERS, DHCP6_OPTION_DOMAIN_LIST, DHCP6_OPTION_SNTP_SERVERS};
const u16_t requested_options[] = {
#if LWIP_DHCP6_PROVIDE_DNS_SERVERS
DHCP6_OPTION_DNS_SERVERS,
DHCP6_OPTION_DOMAIN_LIST
#endif
#if LWIP_DHCP6_GET_NTP_SRV
, DHCP6_OPTION_SNTP_SERVERS
#endif
};
u16_t msecs;
struct pbuf *p_out;
u16_t options_out_len;